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JCCC Honors Journal
Volume 6
Issue 2 Spring 2015
Article 2
2015
A Gardening Lesson From the Natural World:
How Forest Ecosystems Can Provide For Us
Megan Gladbach
[email protected]
Follow this and additional works at: http://scholarspace.jccc.edu/honors_journal
Recommended Citation
Gladbach, Megan (2015) "A Gardening Lesson From the Natural World: How Forest Ecosystems Can Provide For Us," JCCC Honors
Journal: Vol. 6: Iss. 2, Article 2.
Available at: http://scholarspace.jccc.edu/honors_journal/vol6/iss2/2
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A Gardening Lesson From the Natural World: How Forest Ecosystems
Can Provide For Us
Abstract
Though agriculture of the past lead to the rise of civilization, degenerative agricultural practices today may
very well lead to the demise of civilization. Fortunately, nature offers a solution. By studying and manipulating
the inner workings of ecological systems for the gardeners’ benefit, resilient gardens, specifically forest
gardens, can be created. This paper explores processes that occur in the natural world such as the hydrologic
and nitrogen cycles, biotic interactions, and succession and how to mimic them. Concluding with a real-world
example, this paper demonstrates that gardens can thrive with minimal input while still providing an abundant
variety of food, fuel, and other important resources.
Cover Page Footnote
Professor Steve Giambrone was the Faculty Advisor for this Honors contract.
This article is available in JCCC Honors Journal: http://scholarspace.jccc.edu/honors_journal/vol6/iss2/2
Gladbach: A Gardening Lesson From the Natural World
Introduction
The garden has proved itself to be a revolutionary part of human history. With
agriculture, humans were able to transition from nomadic hunter-gatherer lifestyles to stationary
ones. Rather than spend their time foraging for food, humans could spend their time developing
new technologies. As humans continued to evolve, their gardens followed suit. Agricultural
practices today have improved by leaps and bounds from the first cultivated crops; they are
extremely productive and, thus, able to provide food for millions of people. Unfortunately, many
of these practices have become particularly unsustainable in that they meet the needs of the
present but compromise the needs of the future.
The custom of tilling or plowing, loosening soil by digging, stirring, and overturning,
demonstrates the previous statement accurately. While tilling can contribute to a bountiful
harvest by releasing nutrients and helping to suppress weeds, aerating the soil in this manner
negatively affects future generations. To explain, “the life in tilled soil releases far more nutrients
than the plants can use” (Hemenway 82). These unused nutrients then wash away and must be
replaced in the now depleted soil the following season by tilling again or applying fertilizers.
Both of these methods once more provide crops with more food than they can metabolize and
generate runoff filled with an overabundance of nutrients. This runoff pollutes lakes and streams
leading to accelerated eutrophication, a process that “results in the excess growth of algae and
plants [and] diminished lake clarity, light penetration, and oxygen concentrations which can have
impacts on aquatic life” (“Lake Succession and Eutrophication”). In essence, though tilling the
soil provides an abundant supply of food for people today, this practice depletes the soil and
diminishes the water quality of future generations inhibiting their ability to provide for
themselves.
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These illustrated issues call for the need to evolve the garden once more. A different
perspective considers forces of nature as advantages rather than disadvantages. For example,
rather than fertilizing and suppressing weeds by tilling, this new outlook incorporates “weeds” to
fertilize. To illustrate, clover, known to many as a noxious lawn weed, actually forms symbiotic
relationships (“an ecological relationship in which two species live in close contact with each
other”) with bacteria that convert atmospheric nitrogen into a form of nitrogen plants can use
(Reece et al. 570). Moreover, instead of viewing the fact that organisms must eat other organisms
as a burden, this approach thinks of it as a convenience and applies integrated pest management
to encourage predators to eat troublesome pests as an alternative to toxic pesticides. This new
perspective is ecological gardening, growing and cultivating plants by using natural systems as a
guide. By studying and manipulating the inner workings of ecological systems for the gardeners’
benefit, resilient gardens, specifically forest gardens, can be created.
Forest Gardens Defined
Forest gardens imitate woodlands found in the natural world and modify them slightly to
meet human needs. Edible Forest Gardens: Ecological Vision and Theory for Temperate
Climate Permaculture defines a forest garden as “a consciously designed community of mutually
beneficial plants and animals intended for human [use]” (1). If well-designed, these gardens can
potentially offer numerous resources including but not limited to food, fuel, and building
materials without requiring heavy maintenance. Rather than demanding human labor, the
gardens largely support themselves through the teamwork of both living (biotic) and nonliving
(abiotic) factors. The sum of all relationships between these biotic and abiotic factors create
ecosystems; thus, a forest garden is essentially a mimicked ecosystem.
Ecology Defined
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The study of ecosystems on a large scale is referred to as ecology (Bidlack, Jansky, and
Stern 479). In order to create successful forest gardens, several ecological principles must be
considered. Natural cycles including the water, nitrogen, and phosphorus cycles dictate how
plant resources will travel through a forest garden. As various groups of living organisms cross
paths, they will form combinations of positive and negative relationships which range from
affecting species beneficially to detrimentally. Some of the most important interactions will
involve energy flow through food chains and webs. Moreover, succession, “changes in plant
community composition and structure over time”, will determine the structure of a mature forest
garden and, therefore, the initial placing of various plants (Jacke 239). Each of these ecological
principles operates slightly differently depending on an area’s conditions; however, addressing
the ecological principles of every possible forest garden location in this paper is not feasible. For
that reason, the roles of the ecological principles will be discussed in only the context of the
temperate broadleaf forest, the “[environment] located throughout midlatitude regions where
there is sufficient moisture to support the growth of large, broadleaf deciduous trees” (Reece et
al. G-34).
The Hydrologic Cycle
Aside from sunlight, the first plant need that typically comes to a gardener’s mind is
water. All of Earth’s living organisms require this valuable compound, and all must rely on the
hydrologic or water cycle, “[the] constant movement of water from the Earth into the atmosphere
and back again”, to obtain it (Raven, Evert, and Eichhorn 705). During the water cycle,
evaporation (“the process by which a liquid changes to a gas”) and transpiration (“the
evaporative loss of water from a plant”) carry water as vapor into the atmosphere (Reece et al. G13, G-35). The accumulating water vapor will eventually become too dense for the atmosphere to
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hold, and precipitation will cause the water to fall from the atmosphere. This rain will either
move through “the soil and its layers by gravity and capillary forces” (percolation) and become
available for plants to utilize or runoff into a larger body of water (“Description of the
Hydrologic Cycle”). If the water is absorbed up by a plant, it will ultimately exit as water vapor
through the leaves of that plant by a process called transpiration, but if it ends up in a larger body
of water, it will eventually evaporate. Both outcomes result in the repetition of the water cycle
(Raven, Evert, and Eichhorn 705).
In the forest garden, the goal is to maximize percolation and minimize runoff and
evaporation so that plants have an amble supply of water available to them. A diverse
combination of water-conservation techniques accomplishes this. Swales, “shallow trench[es]
laid out dead level along the land’s contours...”, slow runoff and allow it to sink into the ground
where it can be stored (Hemenway 287). Utilizing both living and non-living mulches as well as
dense plantings can reduce evaporation, control erosion, and offer soil stabilization. In addition,
native plants adapted to the site’s water conditions and soil high in organic content effectively
conserve water (98). Incorporating a blend of water-conservation practices saves the gardener
from the fatal mistake of putting all their eggs in one basket; if one method fails, several more
are present to serve as backup.
Nutrient Cycles
In addition to water, plants also require nutrients for optimal growth and development,
and, like water, many of these nutrients cycle through the environment. This paper will examine
two of the many nutrient cycles, the nitrogen cycle followed by the phosphorus cycle.
Although about 78% of Earth’s atmosphere contains nitrogen, plants cannot readily use
this form of nitrogen. Plants must count on processes within the nitrogen cycle to convert
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atmospheric nitrogen to nitrogen compounds they can use such as ammonium and nitrate. These
processes include ammonification, nitrogen fixation, nitrification, and assimilation (Raven,
Evert, and Eichhorn 692). Ammonification occurs as decomposing organic matter releases
ammonium. Nitrogen fixation was formerly mentioned in clover’s ability to form symbiotic
relationships with bacteria, which convert or ‘fix’ nitrogen into a form plants can absorb.
According to Campbell Biology:
One of the more important bacteria involved in [nitrogen] fixation is the genus Rhizobium,
which forms intimate associations with the roots of legumes (such as peas, soybeans, alfalfa,
and peanuts) and markedly alters their root structure... Along a legume’s roots are swellings
called nodules, composed of plant cells that have been “infected” by Rhizobium bacteria.
(794)
Another means by which plants can obtain nitrogen is through nitrification. Nitrification is
similar to nitrogen fixation in that bacteria fix the nitrogen, but unlike bacteria in nitrogen
fixation which live in root nodules, bacteria in nitrification are free-living soil bacteria (Raven,
Evert, and Eichhorn 707). In order for a plant to finally use the nitrogen obtained from
ammonification, nitrogen fixation, or nitrification, assimilation must take place. By turning
“inorganic nitrogen (nitrates and ammonia) into organic compounds”, assimilation allows plants
to metabolize the nitrogen they absorbed from ammonification, nitrogen fixation, or nitrification
(Raven, Evert, and Eichhorn 699). At last, the plants have taken up their share of nitrogen, and
the nitrogen can now begin its journey throughout the cycle again.
Whereas the majority of nitrogen exists in the atmosphere, the majority of phosphorus
exists within the Earth’s crust. As phosphoric rocks weather and erode, microscopic particles of
phosphorus become available for plants to absorb. When organisms like plants or animals that
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have consumed phosphorus die, decomposers break the phosphorus within these organisms back
down returning it to the soil where it can potentially be utilized by a plant a second time.
Phosphorus can also leech out of soil to a larger body of water such as a lake or ocean. Here, the
phosphorus and other sediment particles will settle to the water’s bottom and become rock from
pressure repeating the cycle once more. Although phosphorus readily exists in the soil, its scant
and fairly immobile nature makes it difficult for plants to obtain. While bacteria play an
important role in helping plants obtain nitrogen, mutualistic associations between fungi and roots
help plants obtain phosphorus. These mutualistic associations are referred to as mycorrhizas
(Raven, Evert, and Eichhorn 316). Two types of mycorrhizas exist, endomycorrhizas and
ectomycorrhizas. In endomycorrhizal associations, the fungus penetrates the host cells. In
ectomycorrhizal associations, the fungus “forms a sheath, or mantle, that surrounds the roots and
also a network (the Hartig net) that grows around the [host] cells” (316). The presence of
mycorrhizas increases the surface area of a plant’s roots and, hence, allows plants to extend great
distances in order to better acquire phosphorus.
Now that an understanding of the nitrogen and phosphorus cycles has been gained, a
discussion of someways to embrace these nutrient cycles in the forest garden can take place. To
imitate ammonification in the forest garden, leaf and other organic matter can be left on the
ground rather than raked away. Allowing matter to decompose or compost in place will not only
feed the forest but also create less work for the gardener. Because “the most efficient nitrogenfixing bacteria are those that form symbiotic relationships with plants”, species such as clover
and legumes should be utilized in a forest garden to replenish the soil with nitrogen (Raven,
Evert, and Eichhorn 707). Encouraging mutualistic associations of mycorrhizas to form can also
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help plants get the minerals they need for optimal health. As demonstrated, forest gardens can
generate self-renewing soil fertility if nutrient cycles are welcomed by the gardener.
Biotic Interactions and the Importance of Biodiversity
The significance of biotic interactions, interactions between living organisms, was
already illustrated in the previous section. To clarify, mycorrhizas assist in acquiring crucial
nutrients for plants. In this mutualistic relationship, both organisms benefit: the plant more easily
gets its nutrients while the fungi “receives... plant carbohydrates and vitamins essential for its
[own] growth” (312). Additional combinations of positive and negative relationships include
predation, parasitism, and competition among others. In predacious and parasitic interactions,
one organisms benefits while the other suffers. If organisms experience competition, both
organisms are harmed (Reece et al. 1215). In the following paragraphs, creating these types of
biotic interactions through biodiversity (“the variety of organisms present... as well as the
diversity of habitats and ecosystems”) will be examined (Hemenway 286).
Because mutualism results in the most positive outcome, it is in the forest garden’s best
interest to maximize this type of interaction. When it comes to examples of mutualistic
interactions, mycorrhizas are just the tip of the iceberg, but the, perhaps, most important
mutualistic interaction is that between pollinator, the species who pollinates, and pollenizer, the
plant species being pollinated. Without pollination, “the transfer of pollen from an anther [the
‘male’ part of the flower] to a stigma [the ‘female’ part of the flower]”, fruits seen in a typical
grocery store such as apples, strawberries, and tomatoes would not exist (Bidlack, Jansky, and
Stern 600). Furthermore, without fruit formation, hundreds of thousands of plants could not
reproduce. Pollination provides food for people and wildlife and also enables the pollenizer to
give rise to another generation. To guarantee pollination in the forest garden, the designer should
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incorporate a wide variety of pollenizers for a wide variety of pollinators. Different pollinators,
including insects, birds, and mammals, pollinate different species. Flower color, shape, and odor
as well as nectar and pollen levels attract different species (“Simple Truth Brochure”). Not only
will incorporating a diverse array of plants promise pollination, but it will also protect plants
from pests which brings us to our next series of biotic interactions.
Pests can be detrimental to a forest garden or any ecosystem for that matter if left
unchecked; unbalance often wrecks havoc. Various living creatures can help maintain ecosystem
balance by eating opportunistic organisms, species who have outstepped their boundaries and are
too high in numbers. Types of feeding relationships include predation and parasitism. Before
diving into these relationships, how food energy is transferred throughout an ecosystem must be
investigated. Light energy originates from the sun and is then transformed by producers into
chemical energy through a process called photosynthesis (Bidlack, Jansky, and Stern 600).
Consumers who cannot create their own energy must obtain their energy from these producers.
To do so, primary consumers will eat the producers, secondary consumers will feed on these
primary consumers, and tertiary consumers will devour the secondary consumers. The cycle ends
with decomposers who provide minerals and nutrients for the producers (Reece et al. 1202).
Much of the time, this flow of energy is shown through food chains and webs. Food chains are
linear flows of energy often in the form of a pyramid. The pyramid illustrates the amount of
energy generated by producers and available to primary, secondary, and tertiary consumers.
Because “[energy] escapes in the form of heat... from one level to another[,]... the final consumer
gains only a tiny fraction of the energy originally captured by the producer at the [base of the
pyramid]” (Bidlack, Jansky, and Stern 500). Food webs resemble a net of many interlocking
food chains. Both food chains and webs demonstrate how energy travels through an
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environment. Now that the transformation of food energy throughout ecosystems has been
examined, the types of feeding relationships noted previously, predation and parasitism, can be
discussed.
Predators and parasites defend plants in the forest garden by snacking on uncontrolled
populations of pests. Ladybugs eating aphids finely portray the first feeding interaction,
predation. Aphids, “small, soft-bodied insects with long slender mouthparts... [used] to pierce
stems, leaves, and other tender plant parts and suck out fluids”, damage crops tremendously
(Flint). Fortunately, ecology has a solution: the natural predator of the aphid, the ladybug. In this
example, the plant represents the producer, the aphid stands for the primary consumer, and the
ladybug symbolizes the secondary consumer. Ladybugs and other predators like spiders will
ensure that no pest population ever gets too out of control. The next feeding interaction,
parasitism, can be exemplified by the parasitic braconid wasp and cabbageworm caterpillar. The
adult wasp lays its eggs inside its host, the caterpillar, and the hatchings will emerge within the
cabbageworm’s body and eat it, literally, to death (Hemenway 153). Just as biodiversity helped
encourage the mutualistic interaction of pollination, biodiversity also promotes beneficial
predacious and parasitic interactions. The friendly ladybug and parasitic braconid wasp
introduced can only stay in a forest garden if there is habitat for them. A mixture of numerous
plant species provides this necessary habitat allowing the natural predators to do their jobs
successfully (26).
The final biotic interaction, competition, results in the worst outcome and should,
therefore, be minimized in the forest garden. Competition takes place when “...two species or
individuals living near each other need the same resource, and that resource is scarce...” (Jacke
132). Most of the time, competition takes place between two members of the same species
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because members of the same species require the same resources. These intraspecific
relationships (relationships between members of the same species) contrast with the interspecific
relationships (relationships between members of different species) explored earlier in mutualism,
predation, and parasitism (The Fuse School). Once again, biodiversity comes in to the rescue. An
assortment of vegetation works nicely because “...plants [that] have different leaf forms, light
requirements, and rooting depths” do not compete for resources (Hemenway 176).
As illustrated above, an awareness of the importance of biodiversity in creating biotic
interactions ensures pollination, protects the forest garden from pests, and reduces competition
between plants for resources. In order to ensure these interactions continue to exist as a forest
garden establishes itself, the gardener must plan accordingly at the beginning. Succession
prepares the individual for the mature forest garden.
Succession
The final ecological principle, succession, causes changes in soil moisture and fertility,
sunlight levels, and biotic interactions to take place (Jacke 245). Consequently, careful research
and planning accounting for succession must take place in the primary design of a forest garden.
Classically defined, succession is “an orderly progression of changes in the composition of a
community from the initial development of vegetation to the establishment of a climax
community” (Bidlack, Jansky, and Stern 603). One must realize, this definition is flawed in that
it over-simplifies “the complex reality of plant community change over time” (“About Forest
Gardening”). Only very rarely will an ecosystem ever truly reach the climax community phase,
“the final stage in a successional series” (Raven, Evert, and Eichhorn G-5). Regardless, the basic
principles of this classic idea of succession stand true for forest garden design purposes and will,
therefore, be applied (Jacke 287).
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Classical succession can be further subdivided into primary and secondary succession.
Primary succession occurs when a community must colonize an area where no soil was
previously present (Bidlack, Jansky, and Stern 489). For instance, when two tectonic plates
collide with each other and an island forms, soil does not automatically exist on the island. The
soil must form gradually from the weathering of rocks and eventually the decomposition of the
plants and other organisms that populate the area. In addition to the formation of new islands,
retreating glaciers, landslides, and lava flows are also examples of primary succession. In
contrast to primary succession, secondary succession occurs when the soil remains in tact (492).
Forest fires demonstrate secondary succession. Forest fires wipe out all the large species of
plants exposing the soil to sunlight. Pioneer species who thrive in direct sunlight quickly come in
to protect the bare ground until larger bushes and trees establish themselves. As the larger
species mature, the pioneer species will die back, and the forest will reach a stable point
becoming a climax community until another major disturbance takes place. Forest gardening
primarily pertains to this type of succession where existing soil and biomass (“living or dead
tissues, chemicals, or other organics material produced by plants, animals, microbes, or other
living things”) are already prevalent (Jacke 349).
A gardener can obtain their desired forest garden through accelerated succession which
entails planting all the species (both pioneer and trees) at once. Initially, a newly planted food
forest will have a high percentage of full sun loving plants. As succession continues to alter
sunlight availability for different layers of the forest garden over time and the canopy of the trees
initially planted fills in, the understory of the forest garden will gradually progress from these
full-sun plants to part-sun loving plants and eventually to shade-tolerant plants. Pioneer species
referred to as buffer plants and nurse plants that serve to help chosen species flourish will die
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back as the canopy fills in over the years. When the forest garden finally reaches its ‘climax’, the
gardener will get what was set out for in the first place: a mature canopy weighed down by heavy
fruit.
The Design
With these presented ecological principles in mind, the following forest garden was
designed specifically for Johnson County Community College’s (JCCC) Open Petal Farm (see
figures A-D below). The design process consisted of a multitude of activities including
developing a vision and mission for the project, assessing proposed project locations, consulting
stakeholders of the project, creating a budget and implementation plan, presenting the project in
order to obtain funds for needed materials and labor, and further refining the project until all
wants and needs of those involved were satisfied. Future endeavors for the forest garden will
include installation, maintenance, reevaluation, and further refinement. These design process
activities and future efforts will be further discussed below.
JCCC’s forest garden project ignited with a mission to promote regenerative agricultural
practices and strengthen the campus community by inviting people from across the disciplines to
utilize the garden as an educational tool. Planned to largely maintain itself, the forest garden will
consume minimal resources. Dense plantings, mulches, and swales will be utilized to conserve
water while nutrient accumulators and nitrogen fixing plants will take the place of synthetic
fertilizers and improve soil quality. Furthermore, the perennial nature of the forest will promote
soil conservation and carbon sequestration as well as provide wildlife habitat. All of these
diverse factors will contribute to a farm more resilient to severe weather, disease, and pests in the
long run.
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The forest garden will also promote community engagement by welcoming different
departments on campus to utilize the forest garden as an educational medium. The forest garden
will not only enhance the sustainable agriculture program by introducing students to
agroecology, the science of integrated, sustainable food-system design based on natural systems,
but also improve courses in biology, horticulture, environmental science, art, and anthropology
among others. Students and their instructors will be invited to visit the forest garden to apply
classroom material and theory. This opportunity in experiential education will allow students’
knowledge to be taken to a whole new level. Students can watch plants transform from seed to
fruit. Students can touch the textures of the farm’s variety of crops. They can hear the crunch as
they bite into nuts, taste the sweet juice as they snack on berries, and smell the fresh compost
fertilizing their own crops. The forest garden will give students the opportunity to engage their
five senses and open their eyes to the incredible world around them.
After the mission and vision of the project was identified, assessment of the land began.
Open Petal Farm lies in a temperate climate where Missouri’s deciduous forests meet Kansas’s
grasslands and prairies. Aerial photos of the land and walks about the area revealed that the
initial vegetation consisted of turf grass and two mature mulberry trees while the land sloped
towards the east. Incoming energies such as road noise, neighbors, students, faculty, and staff at
JCCC, sunlight, storm runoff, and wind among others entered the site from various directions
and were taken into account to create a design appropriate for the conditions. Soil samples were
gathered to determine the health of the soil, and measurements of the square footage of the land
were taken. Some of the most valuable information about the land was obtained from
interviewing those who work closely with the farm, such as the campus farm manager, which
ties closely to the next point, assessment of the people.
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Assessment of the people is, perhaps, even more important than the land’s assessment
because, without support from people, a project cannot succeed. For this reason, support was
sought out from the Student Sustainability Committee (SSC), a group of JCCC students charged
with allocating the Sustainability Initiatives Fund for the advancement towards a more
sustainable campus. After presenting a preliminary design to the SSC and receiving feedback, a
refined design, budget, and implementation plan were later presented. Following this second
proposal, the SSC agreed to fund trees, shrubs, and other various plants needed to establish the
forest garden as well as supplies such as rakes to maintain the forest garden. The SSC also
agreed to provide funding for seating and arbors to create an inviting environment for any future
forest garden visitors.
With funding for the garden in place, the implementation plan will be able to begin in
Fall 2015. Volunteers will provide the labor for the installation of the garden, and the Sustainable
Agriculture program will be held responsible for the forest’s maintenance in the future. In
repayment for this maintenance, produce from the forest garden will supplement the harvest of
JCCC’s Campus Farm and be sold for the Sustainable Agriculture program’s benefit. Over the
course of the years, students with the Sustainable Agriculture program will have the opportunity
to reevaluate the forest garden and further refine the garden as they see fit. Overall, this
experience will provide students with a strong sense of empowerment, gained confidence, and
self-worth demonstrating the endless possibilities of sustainable agriculture.
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A
FIGURES
A. An arial view of JCCC
for whom the forest garden
was designed. The star
represents where the project
will be implemented.
B. A closer view of JCCC’s
Open Petal Farm.
C. The design key to plants
and structures.
D. The illustrated design.
Mulberries (the pink trees)
were already present on the
site and incorporated into
the design.
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B
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Serviceberry
Mulberry
Aronia
Persimmon
Seaberry
New Jersey Shrub
Mixed Wildflowers;
Nitrogen Fixers; Nutrient
Accumulators etc.
Honeyberry
Chestnut
Goji Berry
Bush Cherry
Pawpaw
Currant
Hazelnut
Swale
Gooseberry
Path
Jostaberry
C
Jujube
Elderberry
D
1 square = 15 feet
Conclusion
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By studying and manipulating the inner workings of ecological systems for the
gardeners’ benefit, the past unsustainable gardening methods presented earlier in this paper can
progress into more modern gardening practices that meet the needs of both present and future
generations. Nature provides everything a resilient forest garden needs to thrive. Water and
nutrients cycle freely throughout the mimicked ecosystem and support the survival of countless
species in the forest garden. Interactions between living organisms created from biodiversity
pollinate flowers, offer plants protection from pests, and keep species from fighting over each
other for resources. Ultimately, the forest garden evolves through succession to provide a
sustainable, diverse, and ecologically sound environment for plants, animals, insects, and
humans. So long as the gardener invites these ecological principles into their forest gardens with
open arms, the natural world will always graciously offer its wisdom.
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Works Cited
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“Description of Hydrologic Cycle.” Nwrfc.noaa.gov. The National Oceanic and Atmospheric
Administration, n.d. Web. 22 May 2015.
Flint, M. L. "Aphids Management Guide." UC Davis Integrated Pest Management. University of
California, n.d. Web. 19 May 2015.
Hemenway, Toby. Gaia's Garden: A Guide to Home-Scale Permaculture. 2nd ed. White River
Junction, VT: Chelsea Green Pub., 2009. Print.
Jacke, Dave, and Eric Toensmeier. Edible Forest Gardens: Ecological Vision and Theory for
Temperate Climate Permaculture. Vol. 1. White River Junction, VT: Chelsea Green
Pub., 2005. Print.
“Lake Succession and Eutrophication.” Government of New Brunswick. Government of New
Brunswick, n.d. Web. 1 Dec. 2014.
Raven, Peter H., Ray F. Evert, and Susan E. Eichhorn. Raven Biology of Plants. 8th ed. New
York: W.H. Freeman, 2013. Print.
Reece, Jane B., Lisa A. Urry, Michael L. Cain, Steven Alexander Wasserman, Peter V.
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http://scholarspace.jccc.edu/honors_journal/vol6/iss2/2
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